Hi! I understand that the photo you take with the PictureThis app appears distorted and elongated, even though your camera itself seems to be functioning properly. Let's work through some possible reasons and solutions for this issue on your Mac with OS X 10.15.7.

First, could you please clarify: Are you taking photos directly within the PictureThis app on your Mac, or are you importing photos taken elsewhere? Also, is this distortion happening consistently with all photos or only with certain plants or lighting conditions?

Meanwhile, here are some steps you can try:

1. Check Camera Settings in PictureThis:
- Sometimes the app may apply filters or automatic cropping that can distort images. Open the app settings/preferences and look for any image adjustment, zoom, or aspect ratio settings. Set them to default or turn them off to test if distortion persists.

2. Use the 360 Identify Feature:
- Some users have found that using the "360 identify" mode (taking photos from multiple angles) gives more accurate, less distorted images than a single photo mode. Try using this method and see if it resolves the elongation1.

3. Lighting and Angle:
- Take photos in good lighting with minimal shadows. Also try changing the distance and angle slightly, as extreme close-ups or awkward angles can cause optical distortion.

4. Update the App and macOS:
- Ensure the PictureThis app is updated to the latest version available for your OS. Similarly, while you're on OS X 10.15.7 (Catalina), check for any minor system updates that could improve camera compatibility.

5. Restart and Reinstall:
- Restart your Mac to clear any temporary glitches.
- If issues continue, try uninstalling and reinstalling the PictureThis app from the official source.

If after trying these steps the distortion remains, it might be helpful to see the photos causing the issue or check if there's any known bug for your specific OS version. Feel free to also let me know more details about when the distortion happens.

Are you able to try these steps and let me know if the problem improves?